# Forces 1

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• Forces 1
• 1) Recall the law that applies when two objects push or pull on each other, and apply it to a car tyre.
• When two objects push/pull on each other, they exert and equal or opposite force called action and reaction.
• The unit of force is Newtons (N)
• The tyre exerts a downward force on the road, and the road exerts and equal and opposate upward force on the tyre.
• To accelerate the tyre puts a backward force on the road and the road a forwards reaction on the tyre.
• 2) What is a resultant force? What is RIP? What does the term, Balanced forces mean?
• The resultant force is the total of the overall force on an object.
• RIP=Right Is Positive.
• When forces are balanced an object is stationary or steadily moving, and the resultant force is zero.
• 3) Describe the forces on a stationary, accelerating, decelerating and steadily moving car:
• Stationary: Forces are balanced, so resultant force is zero.
• Acceleration: If the resultant force is more than zero (positive) then the object will accelerate.
• Deceleration: When the resultant force is less than zero (negative)
• Steadily moving: When the resultant force is zero, the forces are balanced.
• 4) Describe the relationship between acceleration, mass, and resultant force.
• F=ma, Force(N)=Mass(kg)*Acceleration(m/s^2)
• If you increase the mass, the acceleration must decrease to give the same resultant force.
• If you increase the acceleration, you must decrease the mass to give the same resultant force.
• If you increase the resultant force on a constant mass, the acceleration must increase.
• Resultant force is directly preportional to the mass and acceleration.
• 5) What is the full equation for F=ma?
• Force(N)=Mass(kg)*Acceleration(m/s^2)

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